From fa48b4328c39b2532e47efcfcba6d4031512f514 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Tue, 9 Feb 2016 09:30:21 +1000 Subject: [PATCH] target-ppc: Remove hack for ppc_hash64_load_hpte*() with HV KVM With HV KVM, the guest's hash page table (HPT) is managed by the kernel and not directly accessible to QEMU. This means that spapr->htab is NULL and normally env->external_htab would also be NULL for each cpu. However, that would cause ppc_hash64_load_hpte*() to do the wrong thing in the few cases where QEMU does need to load entries from the in-kernel HPT. Specifically, seeing external_htab is NULL, they would look for an HPT within the guest's address space instead. To stop that we have an ugly hack in the pseries machine type code to set external htab to (void *)1 instead. This patch removes that hack by having ppc_hash64_load_hpte*() explicitly check kvmppc_kern_htab instead, which makes more sense. Signed-off-by: David Gibson Reviewed-by: Alexey Kardashevskiy --- hw/ppc/spapr.c | 7 ------- target-ppc/mmu-hash64.h | 4 ++-- 2 files changed, 2 insertions(+), 9 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 907439a95b..c85a12547f 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -1197,13 +1197,6 @@ static void spapr_cpu_reset(void *opaque) env->spr[SPR_HIOR] = 0; env->external_htab = (uint8_t *)spapr->htab; - if (kvm_enabled() && !env->external_htab) { - /* - * HV KVM, set external_htab to 1 so our ppc_hash64_load_hpte* - * functions do the right thing. - */ - env->external_htab = (void *)1; - } env->htab_base = -1; /* * htab_mask is the mask used to normalize hash value to PTEG index. diff --git a/target-ppc/mmu-hash64.h b/target-ppc/mmu-hash64.h index ab0f86b222..e7d9925411 100644 --- a/target-ppc/mmu-hash64.h +++ b/target-ppc/mmu-hash64.h @@ -102,7 +102,7 @@ static inline target_ulong ppc_hash64_load_hpte0(PowerPCCPU *cpu, uint64_t addr; addr = token + (index * HASH_PTE_SIZE_64); - if (env->external_htab) { + if (kvmppc_kern_htab || env->external_htab) { return ldq_p((const void *)(uintptr_t)addr); } else { return ldq_phys(CPU(cpu)->as, addr); @@ -116,7 +116,7 @@ static inline target_ulong ppc_hash64_load_hpte1(PowerPCCPU *cpu, uint64_t addr; addr = token + (index * HASH_PTE_SIZE_64) + HASH_PTE_SIZE_64/2; - if (env->external_htab) { + if (kvmppc_kern_htab || env->external_htab) { return ldq_p((const void *)(uintptr_t)addr); } else { return ldq_phys(CPU(cpu)->as, addr); -- 2.11.0